AD9680 datasheet(21/97 Pages) AD

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Data Sheet

AD9680

Rev. C | Page 21 of 97

100

ANALOG INPUT FREQUENCY (MHz)

978.5

1065.0

1142.4

1220.0

1297.3

1374.8

1452.2

SFDR

SNR

Figure 42. SNR/SFDR vs. fIN; 1 GHz < fIN < 1.5 GHz;

Buffer Control 1 (0x018) = 6.0×

100

ANALOG INPUT FREQUENCY (MHz)

1513.3

1607.4

1701.6

1795.6

1889.7

SFDR

SNR

Figure 43. SNR/SFDR vs. fIN; 1.5 GHz < fIN < 2 GHz;

Buffer Control 1 (0x018) = 7.5×

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

500

400

300

200

100

AIN1 AND AIN2 = –7dBFS

SFDR = 87dBFS

IMD2 = 93dBFS

IMD3 = 87dBFS

BUFFER CONTROL 1 = 3.0×

Figure 44. Two-Tone FFT; fIN1 = 184 MHz, fIN2 = 187 MHz

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

500

400

300

200

100

AIN1 AND AIN2 = –7dBFS

SFDR = 88dBFS

IMD2 = 93dBFS

IMD3 = 88dBFS

BUFFER CONTROL 1 = 4.5×

Figure 45. Two-Tone FFT; fIN1 = 338 MHz, fIN2 = 341 MHz

–84

–90

–78 –72 –66 –60 –54 –48 –42 –36 –30 –24 –18 –12 –6

INPUT AMPLITUDE (dBFS)

–140

–120

–100

–80

–60

–40

–20

SFDR (dBc)

SFDR (dBFS)

IMD3 (dBc)

IMD3 (dBFS)

Figure 46. Two-Tone SFDR/IMD3 vs. Input Amplitude (AIN) with

fIN1 = 184 MHz and fIN2 = 187 MHz

–84

–90

–78 –72 –66 –60 –54 –48 –42 –36 –30 –24 –18 –12 –6

INPUT AMPLITUDE (dBFS)

–140

–120

–100

–80

–60

–40

–20

SFDR (dBc)

SFDR (dBFS)

IMD3 (dBc)

IMD3 (dBFS)

Figure 47. Two-Tone IMD3/SFDR vs. Input Amplitude (AIN) with

fIN1 = 338 MHz and fIN2 = 341 MHz

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